I really like the Mapleshade racks. They sound and look great plus the infinite adjustability of the shelves. You just need to buy another shelf. Your tube preamp doesn't require anywhere close to the room you have devoted to it. My VAC preamp doesn't even have ventilation slots in the casework by design. My shelf spacing is fairly tight and I have no tube performance or reliability issues. Just tighten up the spacing a bit and buy another shelf.
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